使用AFNetWorking3.0进行图片上传，把image图片转为data 数据。
NSString *postUrl = @"url";//URL
NSData *imageData = UIImageJPEGRepresentation(image, 0.1);//image为要上传的图片(UIImage)
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
[manager POST:postUrl parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> _Nonnull formData) {
//
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"yyyyMMddHHmmss";
NSString *fileName = [NSString stringWithFormat:@"%@.png",[formatter stringFromDate:[NSDate date]]];
//二进制文件，接口key值，文件路径，图片格式
[formData appendPartWithFileData:imageData name:@"file" fileName:fileName mimeType:@"image/jpg/png/jpeg"];
} progress:^(NSProgress * _Nonnull uploadProgress) {
} success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {
//
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
//
}];
